why so uncommon to see fillies rearing-up on their hind hooves when being fucked doggystyle?

closest I have ever seen would be this animation with AJ where they’re leaning on a wagon for balance: https://derpibooru.org/images/2020097

but I was thinking, couldn’t the guy just hug his arms around the pony’s chest to keep her upright?

in human-style anime you see guys holding a girl’s arms behind her back for balance a lot of the time. Obviously you can’t do that with ponies due to flexibility, but why not just hug the chest and she stays upright?

Feels like nobody has ever drawn it even though it’s so sensible.

Sorta like this I guess https://e621.net/posts/2951404 but less humanoid.